There is game inspired by the board game risk. I want to download the demo. The site for this demo is at: http://sillysoft.net/ Click on the link Download free demo. I have a mac os x 10.1.5, so I download the Lux.dmg right? Some first hand help would be useful. After I download Lux.dmg the icon appears in my desktop and when I double click it, it says could not mount. Any suggestions?